Picture frame



FIG. 1 is a top front and right side perspective view of a picture frame showing my new design;

FIG. 2 is a front elevational view thereof, the rear not shown being devoid of ornamentation;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof; and

FIG. 5 is a top plan view thereof, the bottom not shown being devoid of ornamentation. 

An ornamental design for a picture frame, substantially as shown and described. 